/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.innazis.jfrogsurvey.zxing;

import java.io.IOException;
import java.util.Collection;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.KeyEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;

import com.innazis.jfrogsurvey.R;
import com.innazis.jfrogsurvey.zxing.camera.CameraManager;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.Result;
import com.google.zxing.ResultPoint;

/**
 * Example Decoder Activity.
 * 
 * @author Justin Wetherell (phishman3579@gmail.com)
 */
public class DecoderActivity extends Activity implements IDecoderActivity, SurfaceHolder.Callback {
	private static final String TAG = DecoderActivity.class.getSimpleName();

	protected DecoderActivityHandler handler = null;
	protected ViewfinderView viewfinderView = null;
	protected CameraManager cameraManager = null;
	protected boolean hasSurface = false;
	protected Collection<BarcodeFormat> decodeFormats = null;
	protected String characterSet = null;

	@Override
	public void onCreate(Bundle icicle) {
		super.onCreate(icicle);
		setContentView(R.layout.zxing_activity_decoder);
		Log.v(TAG, "onCreate()");
		Window window = getWindow();
		window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

		handler = null;
		hasSurface = false;
	}

	@Override
	protected void onDestroy() {
		super.onDestroy();
		Log.v(TAG, "onDestroy()");
	}

	@SuppressWarnings("deprecation")
	@Override
	protected void onResume() {
		super.onResume();
		Log.v(TAG, "onResume()");

		// CameraManager must be initialized here, not in onCreate().
		if (cameraManager == null)
			cameraManager = new CameraManager(getApplication());

		if (viewfinderView == null) {
			viewfinderView = (ViewfinderView) findViewById(R.id.viewfinder_view);
			viewfinderView.setCameraManager(cameraManager);
		}

		showScanner();

		SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);
		SurfaceHolder surfaceHolder = surfaceView.getHolder();
		if (hasSurface) {
			// The activity was paused but not stopped, so the surface still
			// exists. Therefore
			// surfaceCreated() won't be called, so init the camera here.
			initCamera(surfaceHolder);
		} else {
			// Install the callback and wait for surfaceCreated() to init the
			// camera.
			surfaceHolder.addCallback(this);
			surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
		}
	}

	@Override
	protected void onPause() {
		super.onPause();
		Log.v(TAG, "onPause()");

		if (handler != null) {
			handler.quitSynchronously();
			handler = null;
		}

		cameraManager.closeDriver();

		if (!hasSurface) {
			SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);
			SurfaceHolder surfaceHolder = surfaceView.getHolder();
			surfaceHolder.removeCallback(this);
		}
	}

	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (keyCode == KeyEvent.KEYCODE_FOCUS || keyCode == KeyEvent.KEYCODE_CAMERA) {
			// Handle these events so they don't launch the Camera app
			return true;
		}
		return super.onKeyDown(keyCode, event);
	}

	@Override
	public void surfaceCreated(SurfaceHolder holder) {
		if (holder == null)
			Log.e(TAG, "*** WARNING *** surfaceCreated() gave us a null surface!");
		if (!hasSurface) {
			hasSurface = true;
			initCamera(holder);
		}
	}

	@Override
	public void surfaceDestroyed(SurfaceHolder holder) {
		hasSurface = false;
	}

	@Override
	public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
		// Ignore
	}

	@Override
	public ViewfinderView getViewfinder() {
		return viewfinderView;
	}

	@Override
	public Handler getHandler() {
		return handler;
	}

	@Override
	public CameraManager getCameraManager() {
		return cameraManager;
	}

	@Override
	public void handleDecode(Result rawResult, Bitmap barcode) {
		drawResultPoints(barcode, rawResult);
	}

	protected void drawResultPoints(Bitmap barcode, Result rawResult) {
		ResultPoint[] points = rawResult.getResultPoints();
		if (points != null && points.length > 0) {
			Canvas canvas = new Canvas(barcode);
			Paint paint = new Paint();
			paint.setColor(getResources().getColor(R.color.result_image_border));
			paint.setStrokeWidth(3.0f);
			paint.setStyle(Paint.Style.STROKE);
			Rect border = new Rect(2, 2, barcode.getWidth() - 2, barcode.getHeight() - 2);
			canvas.drawRect(border, paint);

			paint.setColor(getResources().getColor(R.color.result_points));
			if (points.length == 2) {
				paint.setStrokeWidth(4.0f);
				drawLine(canvas, paint, points[0], points[1]);
			} else if (points.length == 4
					&& (rawResult.getBarcodeFormat() == BarcodeFormat.UPC_A || rawResult.getBarcodeFormat() == BarcodeFormat.EAN_13)) {
				// Hacky special case -- draw two lines, for the barcode and
				// metadata
				drawLine(canvas, paint, points[0], points[1]);
				drawLine(canvas, paint, points[2], points[3]);
			} else {
				paint.setStrokeWidth(10.0f);
				for (ResultPoint point : points) {
					canvas.drawPoint(point.getX(), point.getY(), paint);
				}
			}
		}
	}

	protected static void drawLine(Canvas canvas, Paint paint, ResultPoint a, ResultPoint b) {
		canvas.drawLine(a.getX(), a.getY(), b.getX(), b.getY(), paint);
	}

	protected void showScanner() {
		viewfinderView.setVisibility(View.VISIBLE);
	}

	protected void initCamera(SurfaceHolder surfaceHolder) {
		try {
			cameraManager.openDriver(surfaceHolder);
			// Creating the handler starts the preview, which can also throw a
			// RuntimeException.
			if (handler == null)
				handler = new DecoderActivityHandler(this, decodeFormats, characterSet, cameraManager);
		} catch (IOException ioe) {
			Log.w(TAG, ioe);
		} catch (RuntimeException e) {
			// Barcode Scanner has seen crashes in the wild of this variety:
			// java.?lang.?RuntimeException: Fail to connect to camera service
			Log.w(TAG, "Unexpected error initializing camera", e);
		}
	}
}
